What you will learn

• Ecology
• Pollution
• Biodiversity
• Sustainability
• Environmental laws

Course content (30 lessons)

1. Unit 1 Overview — Introduction to Environmental Studies Get a bird's eye view of what we will cover in this unit.
2. 1.1 Multidisciplinary Nature & Components — Multidisciplinary Nature Environmental Studies is not an isolated subject; it is a convergence of multiple disciplines. It is the science of physical phenomena in the environment.…
3. 1.2 Scope & Importance — Scope of Environmental Studies The scope is "all-encompassing" as it deals with every issue that affects a living organism. Natural Resource Management: Conservation of forests,…
4. 1.3 Sustainability & Development — Concept of Sustainability Sustainability is derived from the Latin word sustinere (to hold up). It refers to the ability to maintain or support a process continuously over time.…
5. 1.4 Climate Change & Global Warming — Climate Change Definition: A significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years. Indicators:…
6. 1.5 Ozone Depletion & Acid Rain — Ozone Layer Depletion The Shield: The Ozone layer (O3) sits in the Stratosphere (20-30km up). It absorbs 97-99% of the Sun's medium-frequency ultraviolet light (UV-B), which is…
7. 1.6 International Agreements — Global Efforts for Environment Agreement Year Focus Area Key Outcome :--- :--- :--- :--- Montreal Protocol 1987 Ozone Layer Phasing out of ODS (CFCs). Considered the most…
8. Unit 2 Overview — Ecosystems and Natural Resources Understand the structure and function of nature's systems.
9. 2.1 Ecosystem: Concept & Structure — Concept of Ecosystem An ecosystem is a dynamic complex of plant, animal, and microorganism communities and their non-living environment interacting as a functional unit. Biotic…
10. 2.2 Functions of Ecosystem — 1. Energy Flow The Sun is the ultimate source of energy. Energy flow is Unidirectional (Sun - Producer - Consumer - Heat). It cannot be reused. 10% Law (Lindeman, 1942): Only 10%…
11. 2.3 Terrestrial Ecosystems — 1. Forest Ecosystem Dominated by trees. Tropical Rainforests: Near equator. High rain ( 200cm). Highest biodiversity ("Lungs of the Earth"). Multilayered canopy. Deciduous…
12. 2.4 Aquatic Ecosystems — 1. Freshwater Ecosystems Salt content < 0.5 ppt. Lentic (Static): Lakes, Ponds, Swamps. Zonation: Littoral Zone: Shallow, near shore (Rooted plants). Limnetic Zone: Open water,…
13. 2.5 Ecosystem Services — Review of Services Nature provides services worth trillions of dollars for free. Service Examples Connection to Humans :--- :--- :--- Provisioning Food, Fibre, Fuel, Water,…
14. 2.6 Energy Resources — Growing Energy Needs Population Growth + Industrialization + Improved Lifestyle = Exploding Energy Demand . Energy Sources Classification 1. Renewable (Non-Conventional)…
15. Unit 3 Overview — Biodiversity and Conservation Explore the variety of life on Earth and how to protect it.
16. 3.1 Biodiversity: Concept & Levels — Definition Biodiversity (Biological Diversity) is the variety and variability of life on Earth. It includes diversity at all levels of biological organization: Genes (Genetic)…
17. 3.2 India as Mega-Diversity Nation — Global Status India is one of the 17 Mega-diverse countries in the world. With only 2.4% of the world's land area, India accounts for 7-8% of all recorded species . Biogeographic…
18. 3.3 IUCN Red List Categories — IUCN Red List The International Union for Conservation of Nature (IUCN) maintains a "Red List" of threatened species. It is the world's most comprehensive inventory of the global…
19. 3.4 Value of Biodiversity — Why maintain Biodiversity? 1. Consumptive Use Value: Direct use of products. Food (Cereals, Fruits). Fuel (Wood). Drugs/Medicines (70% of modern medicines come from plants - e.g.,…
20. 3.5 Threats to Biodiversity — The "HIPPO" Acronym The major threats can be summarized as HIPPO: H - Habitat Loss & Fragmentation: The 1 cause of extinction. Cutting forests for farms destroys homes.…
21. 3.6 Conservation Strategies — In-Situ Conservation (On-Site) Protecting species in their natural habitat. "Save the forest to save the tiger." National Parks: Most strict. No human activity (grazing/logging)…
22. 3.7 Case Studies & Movements — Project Tiger (1973) Goal: To save the Royal Bengal Tiger from extinction. Launch: Jim Corbett National Park. Outcome: Tiger population increased from ~1,200 to ~3,600 (2022). A…
23. Unit 4 Overview — Pollution and Control Measures Learn about environmental pollution, its effects, and control strategies.
24. 4.1 Air & Noise Pollution — Air Pollution Definition: Presence of chemicals/particles in the air at levels harmful to health. Major Pollutants: 1. Particulate Matter (PM2.5 / PM10): Tiny dust/soot particles.…
25. 4.2 Water & Thermal Pollution — Water Pollution Types: Point Source: Pollution from a single pipe (e.g., Factory discharge). Easy to regulate. Non-Point Source: Diffused pollution (e.g., Agricultural Runoff with…
26. 4.3 Soil Pollution & Nuclear Hazards — Soil Pollution Causes: 1. Agrochemicals: Excessive fertilizers/pesticides kill beneficial soil bacteria. 2. Industrial Waste: Heavy metals (Lead, Mercury). 3. Plastics:…
27. 4.4 Solid Waste Management (SWM) — Classification of Waste 1. Municipal Solid Waste (MSW): Household trash (Food, Paper, Plastic). 2. Biomedical Waste: Hospitals (Needles, Bandages). Highly infectious . 3.…
28. 4.5 EIA & EMS — Environmental Impact Assessment (EIA) A planning tool to anticipate the environmental damage of a project before it begins. Mandatory in India: Since 1994 (under EPA 1986).…
29. 4.6 Field Work Guidelines — Field Visit Student guidelines for the mandatory field visit. Option 1: Ecosystem Visit Locations: Delhi Ridge, Asola Bhatti Sanctuary, Yamuna Biodiversity Park. Task: Identify…
30. PYQ: End Term December 2023

1.1 Multidisciplinary Nature & Components

Multidisciplinary Nature

Environmental Studies is not an isolated subject; it is a convergence of multiple disciplines. It is the science of physical phenomena in the environment.

Components of Environment

The environment is broadly divided into four interacting spheres:

1. Atmosphere (The Air)

• The gaseous envelope surrounding the Earth, held by gravity.
• Composition: Nitrogen (78%), Oxygen (21%), Argon (0.9%), CO2 (0.04%).
• Structure:
• Troposphere (0-12km): Weather happens here. Humans live here.
• Stratosphere (12-50km): Contains the Ozone layer (O3) which protects us from UV rays.
• Mesosphere & Thermosphere: Upper layers.

2. Hydrosphere (The Water)

• Includes all water on Earth in liquid, solid (ice), and gaseous (vapor) forms.
• Distribution: 97% is Saline (Oceans); only 3% is Fresh water (and most of that is locked in glaciers!).

3. Lithosphere (The Land)

• The solid cool crust of the earth and the rigid upper mantle.
• It consists of rocks, minerals, and soil which provide the substrate for life and nutrients for plants.

4. Biosphere (The Life)

• The narrow zone where Atmosphere, Hydrosphere, and Lithosphere meet and interact to support life.
• It extends from the floor of the deepest ocean to the highest mountain peak.

Continue reading: 1.1 Multidisciplinary Nature & Components →

Frequently asked questions

Is the Environmental Studies course really free?

Yes. The entire Environmental Studies course on Siksha Sarovar is free to read with no account required. You can optionally sign in with Google to save your progress.

Do I get a certificate for Environmental Studies?

Yes — finish the lessons and pass the quiz to earn a free, verifiable certificate you can share on LinkedIn or with recruiters.

Can I run code while learning?

Yes. The built-in online compiler runs C, C++, Python, Java, PHP, JavaScript, C# and SQL directly in your browser — no installation needed.